Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1957_1_3_a4, author = {L. G\r{a}rding}, title = {Eigenfunction expansions connected with elliptic differential operators}, journal = {Matematika}, pages = {107--116}, publisher = {mathdoc}, volume = {1}, number = {3}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_3_a4/} }
L. Gårding. Eigenfunction expansions connected with elliptic differential operators. Matematika, Tome 1 (1957) no. 3, pp. 107-116. http://geodesic.mathdoc.fr/item/MAT_1957_1_3_a4/